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PDF BA1701 Data sheet ( Hoja de datos )
| Número de pieza | BA1701 | |
| Descripción | VSC system processor IC | |
| Fabricantes | ROHM Semiconductor | |
| Logotipo |  |
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Audio ICs
VSC∗ system processor IC
BA1701
The BA1701 is a monolithic audio-compression system controller IC that uses VSC∗.
When used in combination with an analog delay circuit and low-pass filter, it can replay recorded audio at 1 to 2.5 times
the recording speed, without altering the pitch.
FApplications
Audio compression systems for tape-based answering machines and learning aids
FFeatures
1) Wide operating voltage range (4.5V to 14V).
2) Built-in two-phase sweep oscillator that can directly
drive BBD.
3) Built-in motor controller is synchronized with the au-
dio compression ratio.
4) Built-in voltage regulator.
FAbsolute maximum ratings (Ta = 25_C)
FRecommended operating conditions (Ta = 25_C)
∗ VSC is a trademark of The Variable Speech Control Company. This product is manufactured under licence from VSC
Ltd. for use in VSC systems.
861
1 page  
Audio ICs
FCircuit operation
(1) System construction
The BA1701 is a monolithic audio-compression system
controller IC that uses VSC.When used in combination
with an analog delay circuit, low-pass filter, and tape
speed controller, it can replay recorded audio at 1 to 2.5
times the recording speed, without altering the pitch (see
BA1701
Fig. 3).
The BA1701 has a built-in motor driver control circuit that
is synchronized with the pitch control that allows the sys-
tem to be built with just one pitch control potentiometer
(see Fig. 4).
(2) Principles of audio compression (see Fig. 5)
When recorded audio (A) is replayed at high speed, the
pitch of the audio increases in proportion to the playback
speed (B). By expanding this using an analog delay cir-
cuit, a compressed audio signal with the same pitch as
the original recorded signal is obtained (C). Partial audio
dropout occurs when the audio is expanded, but due to
the diffuse nature of speech, the expanded audio does
not sound unnatural to the human ear.
865
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet BA1701.PDF ] | |
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